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Open AccessArticle

Higher Order Feature Extraction and Selection for Robust Human Gesture Recognition using CSI of COTS Wi-Fi Devices

1
School of Engineering, Taylor’s University, 1, Jalan Taylor’s, Subang Jaya, Selangor 47500, Malaysia
2
Faculty of Sciences and Technologies, University of Sidi Mohamed Ben Abdellah, Route Imouzzer Fez, BP 2626, Fes 30000, Morocco
3
Faculty of Science and Technology, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
4
Simulation Metier, Valeo India Pvt Ltd., 1/396, Old Mahabalipuram Road, Navallur, Chennai, Tamil Nadu 600130, India
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(13), 2959; https://doi.org/10.3390/s19132959
Received: 7 May 2019 / Revised: 9 June 2019 / Accepted: 25 June 2019 / Published: 4 July 2019
(This article belongs to the Special Issue Wireless Sensing Systems for Body Area Networks)
Device-free human gesture recognition (HGR) using commercial off the shelf (COTS) Wi-Fi devices has gained attention with recent advances in wireless technology. HGR recognizes the human activity performed, by capturing the reflections of Wi-Fi signals from moving humans and storing them as raw channel state information (CSI) traces. Existing work on HGR applies noise reduction and transformation to pre-process the raw CSI traces. However, these methods fail to capture the non-Gaussian information in the raw CSI data due to its limitation to deal with linear signal representation alone. The proposed higher order statistics-based recognition (HOS-Re) model extracts higher order statistical (HOS) features from raw CSI traces and selects a robust feature subset for the recognition task. HOS-Re addresses the limitations in the existing methods, by extracting third order cumulant features that maximizes the recognition accuracy. Subsequently, feature selection methods derived from information theory construct a robust and highly informative feature subset, fed as input to the multilevel support vector machine (SVM) classifier in order to measure the performance. The proposed methodology is validated using a public database SignFi, consisting of 276 gestures with 8280 gesture instances, out of which 5520 are from the laboratory and 2760 from the home environment using a 10 × 5 cross-validation. HOS-Re achieved an average recognition accuracy of 97.84%, 98.26% and 96.34% for the lab, home and lab + home environment respectively. The average recognition accuracy for 150 sign gestures with 7500 instances, collected from five different users was 96.23% in the laboratory environment. View Full-Text
Keywords: gesture recognition; CSI; Wi-Fi; HOS; cumulants; mutual information; SVM gesture recognition; CSI; Wi-Fi; HOS; cumulants; mutual information; SVM
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Farhana Thariq Ahmed, H.; Ahmad, H.; Phang, S.K.; Vaithilingam, C.A.; Harkat, H.; Narasingamurthi, K. Higher Order Feature Extraction and Selection for Robust Human Gesture Recognition using CSI of COTS Wi-Fi Devices. Sensors 2019, 19, 2959.

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